Document development tips

docs/Development-Tips.md

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+Below is a collection of development tips when running CodaLab locally.
+
+# setting up local instance (-bd is sane default (build, dev mode))
+python codalab_service.py start -bd
+username codalab
+password codalab
+
+# list docker containers running
+docker ps (`docker ps -a` shows all dead containers as well)
+# check logs of docker container
+docker logs codalab_worker_1
+# run commands in container
+docker exec -it codalab_worker_1 /bin/bash
+
+# connect to prod instance from the CLI
+cl work https://worksheets.codalab.org::
+
+# connect to local instance from the CLI
+cl work localhost::
+
+# if you're making changes to the CLI and want to test them out real time,
+# in order to use the current directory's changes as the "cl" executable
+pip install -e .